60 lines
4.3 KiB
HTML
60 lines
4.3 KiB
HTML
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<TITLE>CLHS: Function APPEND</TITLE>
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<A NAME="append"><I>Function</I> <B>APPEND</B></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>append</B> <I><TT>&rest</TT> lists</I> => <I>result</I><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>list</I>---each must be a <A REL=DEFINITION HREF="26_glo_p.htm#proper_list"><I>proper list</I></A> except the last, which may be any <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A>. <P>
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<I>result</I>---an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A>. This will be a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A> unless the last <I>list</I> was not a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A> and all preceding <I>lists</I> were <A REL=DEFINITION HREF="26_glo_n.htm#null"><I>null</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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<A REL=DEFINITION HREF="#append"><B>append</B></A> returns a new <I>list</I> that is the concatenation of the copies. <I>lists</I> are left unchanged; the <A REL=DEFINITION HREF="26_glo_l.htm#list_structure"><I>list structure</I></A> of each of <I>lists</I> except the last is copied. The last argument is not copied; it becomes the <A REL=DEFINITION HREF="26_glo_c.htm#cdr"><I>cdr</I></A> of the final <A REL=DEFINITION HREF="26_glo_d.htm#dotted_pair"><I>dotted pair</I></A> of the concatenation of the preceding <I>lists</I>, or is returned directly if there are no preceding <A REL=DEFINITION HREF="26_glo_n.htm#non-empty"><I>non-empty</I></A> <I>lists</I>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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(append '(a b c) '(d e f) '() '(g)) => (A B C D E F G)
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(append '(a b c) 'd) => (A B C . D)
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(setq lst '(a b c)) => (A B C)
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(append lst '(d)) => (A B C D)
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lst => (A B C)
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(append) => NIL
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(append 'a) => A
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</PRE>
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</TT> <P>
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<P><B>Affected By:</B> None.
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<P>
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<P><B>Exceptional Situations:</B> None.
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<P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_nconc.htm#nconc"><B>nconc</B></A>, <A REL=DEFINITION HREF="f_concat.htm#concatenate"><B>concatenate</B></A> <P>
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<P><B>Notes:</B> None.
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<P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issue</A>, <I>not part of the specification</I>, applies to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss138.htm">DOTTED-LIST-ARGUMENTS:CLARIFY</A><P></UL><HR>
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